Английская Википедия:891 Gunhild
Шаблон:Short description Шаблон:Use dmy dates Шаблон:Infobox planet
891 Gunhild (prov. designation: Шаблон:Mp or Шаблон:Mp) is a large background asteroid from the outer regions of the asteroid belt, that measures approximately Шаблон:Convert in diameter. It was discovered on 17 May 1918, by astronomer Max Wolf at the Heidelberg-Königstuhl State Observatory in southwest Germany.[1] The dark D-type asteroid has a rotation period of 11.9 hours. Any reference of the asteroid's name to a person is unknown.[2]
Orbit and classification
Gunhild is a non-family asteroid of the main belt's background population when applying the hierarchical clustering method to its proper orbital elements.[3][4] It orbits the Sun in the outer asteroid belt at a distance of 2.8–2.9 AU once every 4 years and 10 months (1,769 days; semi-major axis of 2.86 AU). Its orbit has an eccentricity of 0.03 and an inclination of 14° with respect to the ecliptic.[5] The asteroid was first observed as Шаблон:Mp (Шаблон:Mp) at Simeiz Observatory in November 1915. The body's observation arc begins at Heidelberg Observatory on 18 May 1918, the night after its official discovery observation.[1]
Naming
This minor planet is named after a Feminine German first name. Any reference of this name to a person or occurrence is unknown.[2]
Unknown meaning
Among the many thousands of named minor planets, Gunhild is one of 120 asteroids, for which no official naming citation has been published. All of these low-numbered asteroids have numbers between Шаблон:Mp and Шаблон:Mp and were discovered between 1876 and the 1930s, predominantly by astronomers Auguste Charlois, Johann Palisa, Max Wolf and Karl Reinmuth.[6]
Physical characteristics
In both the Tholen- and SMASS-like taxonomy of the Small Solar System Objects Spectroscopic Survey (S3OS2), as well as in the SDSS-based taxonomy, Gunhild is a dark D-type asteroid.[4][7][8] This asteroid spectral type is common among outer belt asteroids and very common among the Jupiter trojan population.
Rotation period
In July 2015, a rotational lightcurve of Gunhild was obtained from photometric observations by the Spanish group of asteroid observers, OBAS. Lightcurve analysis gave a rotation period of Шаблон:Val hours with a brightness amplitude of Шаблон:Val magnitude (Шаблон:Small).[9] The result supersedes period determinations of (Шаблон:Val) by Robert Stephens in 2000,[10] (Шаблон:Val) by Laurent Bernasconi in 2005,[11] and (Шаблон:Val) by Janus Kozdon in 2015 (Шаблон:Small).[12]
Diameter and albedo
According to the survey carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer (WISE), Gunhild measures (Шаблон:Val), (Шаблон:Val) and (Шаблон:Val) kilometers in diameter and its surface has an albedo of (Шаблон:Val), (Шаблон:Val) and (Шаблон:Val), respectively.[13][14][15] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0656 and a diameter of 51.89 kilometers based on an absolute magnitude of 10.0.[16] Alternative mean-diameter measurements published by the WISE team include (Шаблон:Val), (Шаблон:Val) and (Шаблон:Val) with corresponding albedos of (Шаблон:Val), (Шаблон:Val) and (Шаблон:Val).[4][16][17] Several asteroid occultation observed between 2010 and 2014 gave a best-fit ellipse dimension of 52.0 × 52.0 kilometers (one observation) and 63.0 × 63.0 kilometers (three observations). These timed observations are taken when the asteroid passes in front of a distant star.[4]
References
External links
- Lightcurve Database Query (LCDB), at www.minorplanet.info
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Geneva Observatory, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
- Шаблон:AstDys
- Шаблон:JPL small body
Шаблон:Minor planets navigator Шаблон:Small Solar System bodies Шаблон:Authority control
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